This service repair workshop manual covers the Yanmar 12LAK-STE2, 12LAKM-STE2, and 16LAK-STE1 marine diesel engines, designed for marine propulsion. These engines are engineered for reliability and performance in demanding marine environments. This highly detailed factory service manual provides comprehensive information to ensure optimal operation and longevity of your Yanmar marine diesel engine. The purpose of this manual is to provide owners and mechanics with the necessary information for maintenance, repair, and troubleshooting. It includes step-by-step instructions with detailed illustrations and hundreds of photos covering disassembly, reassembly, inspection, service procedures, standard service data, bolt and nut tightening torques, and periodic inspection tables. This 100% complete and intact manual is an essential resource for both do-it-yourself enthusiasts and experienced mechanics.